Grundy County Climate
Grundy County, Iowa
Avg Annual Temp
47.1°F
Annual Precip
37.2"
Annual Snowfall
32.0"
Extreme Heat Days
11.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Grundy County Weather
Cooler than the national median
Grundy County averages 47.1°F annually, reflecting a cooler humid continental climate. The county receives 37.2 inches of precipitation, which is typical for the American heartland.
Slightly cooler than state average
The county's 47.1°F average is roughly one degree cooler than the Iowa state average of 48.0°F. However, it is wetter than the state norm, receiving 37.2 inches of rain compared to 36.1 inches.
Warmer than Fayette and Hamilton
At 47.1°F, Grundy is notably warmer than Hamilton County’s 46.1°F. It experiences a similar snowfall level to Greene County, recording 32.0 inches annually.
Damp years and moderate summers
Grundy sees 11 days of 90°F heat during its 70.9°F average summer. Winters are cold and snowy, with a January average of 17.4°F and 32.0 inches of total snowfall.
Manage moisture and winter chill
With 37.2 inches of annual precipitation, ensuring proper property drainage is essential. Residents should also prepare for a 20.9°F winter average with robust home heating.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.